Steam-engine.



D. FARQUHAR. STEAM ENGINE.

APPLICATION 11.31) MAR. 30.

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erg/um Patented Mar. 2, 1909.

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D. FARQUHAR. STEAM ENGINE. APPLICATION FILED MAB. 30,1908.

Patented Mar. 2, 1909.

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UNITED STATES FATE '13 FFICE.

DAVID FARQUHAR, OF BUFFALO, NEW YORK, ASSIGNOR TO BUFFALO STEAM ROLLER COMPANY, OF BUFFALO, NEW YORK, A BOD-Y CORPORATE OF NEW YORK.

STEAM-ENGINE.

Specification of Letters Patent.

Patented March 2, 1909.

Application filed March 30, 1908. Serial No. 424,063.

To all whom it may concern:

Be it known that I, DAVID FARQUHAR, of Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Steam-Engines and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The primary objects of this invention are to so form the steam dome, piston cylinders, and cross head guides of a steam-engine, as to insure perfect alinement between all the parts; to avoid any injurious effect thereon by the expansion of the boiler; and likewise to so secure the cross head guides at their outer ends as to avoid injuring the boiler shell by longitudinal strains of the pistons.

The invention will be hereinafter fully set forth and particularly pointed out in the claim.

In the accompanying drawings, Figure 1 shows a road-engine embodying my present improvements. Fig. 2 is a horizontal sectional view. Fig. 3 is a view on line 33, Fig. 2. Fig. 4 is a cross sectional view on line 44:, Fig. 2.

Referring to the drawings, 1 designates an approximately rectangular housing having along its lower edge a continuous flange 2 which is designed to be bolted directly to the boiler shell over an opening in the top thereof. This housing constitutes the steam dome. I form integral with the housing, on opposite sides of the center thereof, two piston cylinders 3, and these cylinders are extended rearwardly beyond the housing to form the cross head guides 4, which latter, as is customary, are partly open. The cross head guides are integral with the cylinders. The valve chests 5 are likewise integral with the sides of the housing, the steam being conveyed from the top of the dome through suitable ports (not shown) to such valve chests, from which it is likewise exhausted.

The cross head guides 4 formed by the elongations of the piston cylinders are connected at their rear ends to a spring plate 6 extending transversely of and above the boiler shell, which cross plate at its ends is bolted to supports 7 located at opposite sides of the boiler, such supports consisting of upward extensions of the side-plates of the firebox and of reinforcing plates secured to said side-plates. I thus form a complete enginebed so that the boiler shell will be relieved of the longitudinal strain normally occasioned by the end thrusts of the pistons against the crank shaft. The cross plate 6 is formed of spring or yielding metal so that expansion and contraction of the boiler shell cannot cause the steam dome, piston cylinders, or cross head guides to move out of alinement. In other words, the steam dome, the cylinders, the guides and the valve chests, are cast in one piece, and as the steam dome alone is secured to the boiler shell contraction and expansion of the latter cannot in any way impair the integrity of these several parts, since the springing action of the cross plate 6 readily compensates for all such changes. Furthermore, the cross head guides being tubular bored in line with the piston cylinders, torsional strain on the connecting rods, crank wrists, or cross head pins is rendered impossible.

The advantages of my invention will be apparent to those skilled in the art. It is manifest that by forming the steam dome, cylinders, guides and steam chests integral, I not only avoid all piping, joints and leaks, but I am enabled to so locate the dome on the boiler as to permit the engine to take the heaviest grades without danger of riming. Aside from avoiding all danger of tie parts being moved out of alinement by expansion and contraction of the boiler shell, the boiler shell is relieved of all longitudinal strains of the piston against the crank shaft by reason of the yielding support for the latter being independent of the boiler shell.

I claim as my invention In a steam engine, in combination, aboiler, a support for the engine independent of the boiler shell, a steam dome secured to the boiler shell, piston cylinders and cross head guides, said dome, cylinders and guides being integral, and a spring plate secured to said support and to which said guides are attached.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

DAVID FARQUI-IAR. Witnesses M. J. TODD, W. V. SOHAU'ROF. 

